BEng Mechanical Engineering

This module covers the backbone of modern fluid mechanics, providing an in-depth analysis of the Navier-Stokes equations and the turbulence emergence process. The properties and characteristics of turbulent flows are then introduced, with an aim to develop an understanding of the principle modelling approaches used in real-world applications. These provide a solid foundation that enables students to proficiently analyse and tackle practical engineering problems involving fluid flow.
The concept of flow management is introduced together with a broad description of available techniques to modify fluid flows, such as boundary layers modification and vortex generators in external aerodynamics and the use of suction devices to prevent turbulent transition.
 

To provide students with an in-depth understanding of the Navier-Stokes equations that describe fluid flow phenomena, including the most important limiting cases: creeping flows, inviscid flows, and boundary layers. To develop a qualitative understanding of turbulence, an introductory understanding of the Reynolds decomposition to describe turbulent flows, and to become familiar with the most common approaches to modelling turbulence. To introduce and establish the concept of flow management, and understand its practical relevance through the exploration of selected techniques in real-world applications. To be able to analyse experimental data proficiently and practice presenting and conveying scientific information in written form.

The syllabus is split into the following sections.
The Navier-Stokes equations
• Derivation from first principles.
• Mathematical and physical properties.
• Boundary layer theory.
• Inviscid ideal flows.
• Creeping flows.
Turbulence
• Flow instability.
• The Reynolds experiment and the turbulence emergence process.
• Properties and characteristic of turbulent flows, including the 
• The energy cascade.
• Overview of modelling approaches (DNS, LES, RANS).
• Reynolds decomposition and the Reynolds-averaged Navier-Stokes equations.
• Eddy-viscosity models.
Flow management
• Active and passive management techniques.
• Selected real-world applications, including riblets, vortex generators, wall suction and synthetic jets.
• Streamline curvature.
• Boundary layer control.
Laboratory
Measurement of velocity profiles and turbulence intensity in a pipe flow using hot-wire anemometry. The measured data is then analysed, post-processed and presented in the style of a technical report.
 

Marked reports with feedback to be returned within two weeks of final submission.